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1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
They would either be using an NMEA 0183 or an NMEA 2000 connection. See which protocol both devices support, then use that protocol to network the two devices together.